Abstract

Expression of receptor for advanced glycation end products (RAGE) plays a crucial role in bone metabolism. However, the role of RAGE in the control of osteoblast proliferation is not yet evaluated. In the present study, we demonstrate that RAGE overexpression inhibits osteoblast proliferation in vitro. The negative regulation of RAGE on cell proliferation results from suppression of Wnt, PI3K and ERK signaling, and is restored by RAGE neutralizing antibody. Prevention of Wnt signaling using Sfrp1 or DKK1 rescues RAGE-decreased PI3K and ERK signaling and cell proliferation, indicating that the altered cell growth in RAGE overexpressing cells is in part secondary to alterations in Wnt signaling. Consistently, RAGE overexpression inhibits the expression of Wnt targets cyclin D1 and c-myc, which is partially reversed by RAGE blockade. Overall, these results suggest that RAGE inhibits osteoblast proliferation via suppression of Wnt, PI3K and ERK signaling, which provides novel mechanisms by which RAGE regulates osteoblast growth.

Links

Publisher Full Text

Authors

Li G, Xu J, Li Z

Institution

Department of Emergency Surgery, East Hospital, Tongji University School of Medicine, Shanghai 200120, PR China.

Source

Biochemical and biophysical research communications 423:4 2012 Jul 13 pg 684-9

MeSH

Animals
Cell Line
Cell Proliferation
Glycosylation End Products, Advanced
MAP Kinase Signaling System
Mice
Osteoblasts
Phosphatidylinositol 3-Kinases
Receptors, Immunologic
Signal Transduction
Wnt Signaling Pathway
beta Catenin

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22699121